.combine your summaries of your primary and supplemental papers. You should try

.combine your summaries of your primary and supplemental papers. You should try to link these papers towards the creation of a more coherent literature review. At that point, you can than expand and use other topics outside of the supplemental papers to further improve the quality of your literature review.
As you go with this process, you should start to think about writing a summary of your paper in a form of an abstract as well as work cited. textbook. Use APA style for writing our papers.
The primary paper is
Internal Control Weaknesses and Accounting Conservatism: Evidence From the Post–Sarbanes–Oxley Period. By: Mitra, Santanu; Jaggi, Bikki; Hossain, Mahmud. Journal of Accounting, Auditing & Finance. Apr2013, Vol. 28 Issue 2, p152-191. 
Supplementary papers
Ahmed A. S., Duellman S. (2007). Accounting conservatism and board of director
characteristics: An empirical analysis. Journal of Accounting & Economics, 43, 411-437.
Doyle J., Ge W., McVay S. (2007b). Determinants of weaknesses in internal control over financial reporting. Journal of Accounting & Economics, 44, 193-223.
Zhang J. (2008). The contracting benefits of accounting conservatism to lenders and borrowers. Journal of Accounting & Economics, 45, 27-54